Berlin 2005 – wissenschaftliches Programm
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A: Atomphysik
A 8: Poster HU 1
A 8.11: Poster
Samstag, 5. März 2005, 08:30–18:30, Poster HU
X-Ray Resonant Raman Scattering (RRS) studies on Nickel — •Ch. Zarkadas1, M. Müller2, A.G. Karydas1, B. Beckhoff2, M. Kolbe2, R. Fliegauf2, and G. Ulm2 — 1Laboratory for Material Analysis, Institute of Nuclear Physics, N.C.S.R "Demokritos", Aghia Paraskevi 15310, Athens, Greece — 2Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany
The Resonant Raman Scattering (RRS) effect on Nickel was studied by means of highly monochromatic polarized and unpolarized exciting radiation, respectively. Experiments involving polarized exciting radiation were carried out at the four-crystal monochromator (FCM) beamline for synchrotron radiation from 2 keV to 10 keV in the radiometry laboratory of the Physikalisch-Technische Bundesanstalt at the electron storage ring BESSY II. Resonant Raman spectra of thin Ni foils, having variable thickness, were accumulated at the Ni-Ka and Cu-Ka X-ray beam energies. In the Institute of Nuclear Physics of the NCSR "Demokritos", at the 5.5 MV Tandem accelerator, the Resonant Raman spectrum of a thick Nickel target was also recorded for an unpolarized Cu-Ka exciting beam produced after the proton ionization of a thick Cu target by 1.7 MeV protons in a three-axial orthogonal geometry. In each case, the individual spectra characteristics are described and compared in terms of the excitation conditions. The experimentally determined RRS cross-sections are presented, while the contribution of the RRS effect in the mass attenuation coefficients below the Ni-K edge is also discussed.